Question

Find the power of a concave lense of focal length 2m​

Answer 1

Answer:

The power of the lens, P=

f

1

Focal length of concave lens, f=−2m

P=

−2

1

Then the power of the lens, P=−0.5 dioptre

The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in metres, or P=

f

1

, where P is the power in dioptres and f is the focal length in metres.

Answer 2

The power of the lens,

$p = \frac{1}{2}$

Focal length of concave lens, f=−2m

$p = \frac{1}{ - 2}$

Then the power of the lens, P=−0.5 dioptre

The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in metres, or

$p = \frac{1}{f}$

, where P is the power in dioptres and f is the focal length in metres.

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